Cutter-head.



A. B. LANDIS.

Patented Feb. 20, 1912.

4 SHEETSSHEET 1.

INVENTOR.

I I3, M

IVITNESSES:

TTORNEY.

} j Mj A. B. LANDIS.

CUTTER. HEAD.

APPLIUATION FILED MAR; 4, 1910.

1,017,888. Paten tegnFneTlliggglfiz WITNESSES:

* n! Ell/TOR; X43. 7 M

ATTORNEY A. B. LANDIS.

CUTTER HEAD. APPLICATION FILED MAE. 4,1910.

Patented Feb. 20, 1912.,

4 SHEETS-SHEET 3.

. yVENTOk.

TTORNEY.

J4. flaw j wkww A. B. LANDIS. CUTTER HEAD.

APPLICATION FILED MARA, 1910.

' Patented Feb. 20, 1912.

4 SHEETS-SHEET 4.

WITNESSES: l v INVENTOR.

ATTORNEY.

which are U ED STATES enses;

CUTTER-HEAD.

Specification (if Letters l atent.

- Application filed March 4, 1910. Serial No; 547,250.' v

To all whom it may concern:

Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States,residing at \Vaynesboro, in the county of Franklin and State ofPennsylvania, have invented certain new and useful Improvements inOutter-Heads, of which the following is a specification.

My said invention consists in various improvements in the details ofconstruction and arrangement of parts of cutter-heads designed for useon a screw-cutting machine, whereby such a head is provided thatis verycompact and of, a rigid and secure structure and one that is readily andconveniently adjusted to various sizes and may be quickly andconveniently opened and closed, all as will be hereinafter more fullydescribed and claimed.

Referring to the accompanying drawings made a part hereof and on whichsimilar reference characters indicate similar parts, Figure 1 is a frontelevation of a cut-- tenhead embodying my said invention, Fig. 2 a viewprincipally in central longitudinal section through the same, butshowing a portion of the casing in elevation, Fig. 3 a rear elevation,Fig. 4 a view partly in front elevation and partly in cross section,

' Fig. 5 a detail longitudinal sectionvon the dotted line 55 in-Fig. 4,Figs 6, 7, 8 and 9 detail views illustrating the parts separately, Fig.10 a view partly in front elevation and partly in section, Fig. 11 aview of said cutter-holder partly in side elevation and partly in section, Fig. 12 an underside plan view of said cutter-holder, and Figs 13,14 and 15 detail views illustrating differentparts separately.

Insaid drawings the portions marked A represent the body, or frame, ofthe cutterhead, B the cutter-holders mounted therein and C the cutters.y

The body, or frame A, is of a form best indicated by Figs. 1 4 and 5..In Fig. 5 the particular form is most clearly illustrated.

Itcomprises a casting of suitable size and dimensions for the purpose,having a central aperture and a series of apertures arrangedequi-distant around said central aperture-forming the journals for. thetrunnions of the cutter-holders. Its forward end is formed with a flangea surrounding its outer edge and with a series of overhangof thecutter-holder ing projections a arranged one opposite the axis of eachof the bearings for the several cutter-holders,'fora purpose to bepresently described. It is formed with an annular groove a at'a pointnear its front and with a series of shoulders a, a and a at differentpoints throughout its length. The shoulder a at its extreme rear end, isformedscrew- Patented Feb. 2o, 1912..

threaded and has a disk 2 mounted thereon.

An annular shoulder a and a collar 4 is screw-threaded onto shoulder ato hold s'aid disk-in place. A sleeve A the body A formed with ashouldered front plateor disk-3 is mounted on is mounted on the rear endof end adapted to fit against the front face of collar 4 'and surround.its edge bearing disk 3. Coiled 7 against the outer face of springs ;5are mounted in sleeve A being interposed between collar 2 on the outerend-of body A and the inner end of said recesses. to force the body Arearwardly so that the shoulderadjacent to the front end of said sleevewill normally be" in close contact recesses in said Said springs tendtherewith. Said sleeve A is connected with I the arbor or in a turret ofthe machine.

The cutter-holders B each, comprise a trunnion having a cuttersupporting head extending to one side of the axis thereof and formedwith a'suitable recess or seat to. re ceive the cutters. Each trunnionis formed-- with a. circumferential groove 6 which is adapted'toregister with the groove a in the body A when said trunnions' are slidto posiformed with seg-'v tion. A sectional ring 5" mental notches n' atappropriate intervals adapted to trunnions and then be turned so thataportion between said notches will come into the groove 1) and lock eachtrunnion from longitudinal movement. A "solid ring 6 is mounted aroundsaid ring 6' and a pointed screw 6 is driven through a screw threadedslip over the ends of saidperforation in said ring b lwith its pointengaging in one of the joints -jacent ends of the sections of ring 6',serving to clamp said sections rigidly within between the adsaid ring 6and also hold them with the wide portions in engagement with the grooves15 of the trunnions. By this means the trunnions of he severalcutter-holders are secured in the body A and held agamst anylongitudinal movement but permitted to rotate. Said trunnions are eachformed a circumferential groove 11 near its outer rear end of a plungerwith a bearing extension 6 on its inner rear corner and with a bearingextension I) on its outer front corner, for a purpose to be presentlydescribed. Each of said trunnions is formed hollow, or with alongitudinal central perforation, in which is plunger '10. Each plungeris formed with end. .Another ring 12 formed with a series of segmentalnotches 13 is adapted to slip over the ends of said several plungers andbe turned to bring the flange between the notches 13 into thegrooves 11so that the inner ends of said plungers are all connected to said ring12. The periphery of said ring 12 is formed with spiral ribs, orthreads, as shown most plainly in Fig. 6. A cylindrical nut, or casing,A? is mounted on body A, its front end resting ,upon the shoulderadjacent to the rear face of ring b while its rear end engages theperiphery of disk 3. Each of the trunnions B is cut-away on its rearoutside corner, as best illustrated in Figs. 2 and 11, leaving only theinner portion 72 of the trunnion to extend substantially the full lengthof the bearing in the body A. An annular chamber is thus formedsurrounding the rear ends of said trunnions and inclosed by the cylinderA in which the ringf12, engaging'with the 10, is mounted. The innersurface of said cylinder A is formed with threadsv which correspond toand engage with the threads on the periphery of ring 12. A transversescrew 14 is mounted in a transversesocket or housing formed on the topof cylinder-A being held from longitudinal movement therein by a nut 15on one end and a shoulder near its opposite end,

, in said ring.

the nut bearing upon one end of the socket and the shoulder supon theother end, as shown most clearly in- Fig. 9. The threads of said screw14: engage with threads on the periphery of the disk 3 and by turningsaid screw it will operate to turn the cylinder A and through theengagement between the threads and grooves of ring 12 and said cylinderwill slide said ring and the plungers 10 with which it is "connected.

Said ring 12 15 held from rotation by a pin 16 seated in body ,A andextending out therefrom to project through a perforation Disk 3 isnormally locked to the sleeve A which is fast upon the spindle or turretof the machine, by means. of a latch-pin 17 mounted in the flange ofsaid sleeve and projecting into a perforation 18 in the adjacent face ofsaid disk. A stiff coiled spring 19 is mounted in a recess in the innerface of disk 3 one end, 6, of said spring being turned gaged with asocket in the periphery of body A anl the other end. 0, being turnedoutface of said disk 3. Said spring is arranged mounted a slidingdownwardly and enso that its tension is directed to turn disk 3 andcylinder A connected therewith to open the die when the latch-pinl'? isdisengaged from the perforation 18 as will be *resently described. A pin20 is mounted in the periphery of the'flange of sleeve A adjacent to theface of-disk 3 and another pin 21 is mounted in said disk 3 extendingoutwardly therefrom across the path of said pin 20.

In operation, when the die has cut to the limit of the movement forwhich it is set and the carriage stops, the further rotation of the workwill draw the body A out of the sleeve'A' until the latch-pin 17 isdisengaged from the perforation 18, when spring 19 will expandandoperate to throw disk 3 and cylinder A around until the pin 21 contactswith the pin 20 and limits said movement. Said operation draws ring 12and plungers 10 back and permits the die to open. Eachof the trunnions Bis also formed with a tan ential notch 23 in its outer face with w ichthe corner, of a plunger 24 is adapted to engage. One of said plungers 21 is mounted in a socket between'the adjacent sides of the severalbearings for the trunnions, as best shown in Fig. 4. Said plungers slideradially in said -sockets being held against the notches by coiledsprings 24 bearing between said plungers and a screw-plug 25 in theouter end of each of said sockets. The inner ends wardly to open thedie. After the work has been removed and the carriage starts on itsreturn the operator, by means of handle 26,

tracting said spring and returning the aperture 18 to register withlatch-pin 17. As soon as said latch-pin reaches the perforation, springs5 operate to slide body A backward in sleeve A bringing the face of theforward-end of the flange ofsaid sleeve and locki ig the die in closedposition. The turning of cylinder A also moves plungers 10 forward andcloses the die ready for the next cutting operation. I

The plungers 10 are formed as best shown in Fig. 15 with three differenttapered faces on their front ends. One of said faces f tapers to thecenter of said plunger. Another f tapers to a point a short distancefrom said center, while the other face f is of a still shorter angle andtapers back to of said plungers are formed with one corner,

of the trunnions and throw the cutters outi the rearface of disk 3together and thus.

turns cylinder A against spring 19 conin point still farther from thecenter.

slot f is formed in the front end of said plunger with which ascrew-driver may be engaged to turn said plunger to bring either facedesired into engagement with the back of the cutter-holder.

The cutter-holders B each have a cutterholdinghead B which projects toone side desired to adjust the die to any pre-deter mined size the screw14 is turned to rotate cylinder A in the appropriate direction, which,through its screw-threaded connection with ring 12, willslide theplunger .10

longitudinally in the appropriate direction to secure the desiredadjustment, By bringing the different faces f, f and f successively intoengagement with the bearing plates b the degree of adjustment inrelation to the longitudinal movement of the plunger maybe varied sothat the space provided'for themovement of ring 12 inside of cylinder Acan be comparatively short and enable the head to be made compact and ofcomparative small size. Where the adjustment required is but slight thelong taper may be sufficient to effect the change desired.

1 Where a greater change in size is required it may be necessary tobring one of the shorter angles into operation on the plate I)". Thiscan be readily done by turning plungers by means of a screw-driverinserted 1n the slot f, formed in each, the cutter-holders yielding byturning on their axis against the plungers 23 and springs 24 to permitthe movement. Thus the fixed size of the die is secured by adjusting theposition of ring 12 in cylinder A while the opening and closing isaccomplished by the turning of cylinder- A to slide ring 12 and theplungers 10 back and forth.

The forward ends of the trunnions B are formed with extensions 6 ,ontheir outsides, opposite the axis from the work, and diametricallyopposite the" extensions on their.

inner ends, to give greater bearing surface against the straln of thework.

The cutters O are each of the form best flanges b on the outside cornerof the recess formed in head B to receive said cutters. The opposite, orinner, edge of'said.

vinder.

'. threade diagonally extending perforation in a socket c and projectsinto the perforation provided for the cylinder 0 its inner end engagingwith a notch in one side of said cyl- By the use of a screw-driver saidscrews 0 may be driven into their cam faces firmly'against the innertapered edgesof the cutters. This means serves to force said cutters notonly outwardly but also to force them back firmly against the face ofthe.

seat, or recess, provided therefor in the head B, .thus securing saidcutters rigidly in position and in a manner which provides for theirready and convenient removal, or replacement. In the back of each ofsaidcutters are formed a series of transverse notches a with whicha'series of annular collars c on the adjusting screws C are adapted toengage. Each of said adjusting screws C is mounted in a perforation inthe part B which perforation cuts into the seat provided for the back ofa cutter C. Said erforation is screw-threaded and the peripheries of({he collars or rings 0 are also screwand adapted to engage withthescrew-threads of said perforation so that the turning of said screw Cwill operate to adjust it longitudinally and carry with it the cutter C,which is engaged therewith by.

meansof the transverse grooves in its back.

When it is desired to remove a cutter the appropriate screw 0 is hackedso that cam C may be turned to release thecutter from the engagementbetween said cam and theflange 6 on the outer edge of the part B, whichpermits the cutter to be taken out and another put in, when the screw 0is turned up to force the cam-over and clam said cutter .in place, asbefore. When it is desired to adjustthe cutter longitudinally, screw 0is backed slightly so as to ease up the clamp sufliciently to permitsaid cutter to slide be tween the clamping face without being releasedfrom itsseat, when by turning the screw C inthe appropriate directionsaid cutter may be adjusted as desired, when screw 0 is again turned upto clamp the cutter in the adjusted position.

It will be noted by reference to Fig. 1 1

that the clamping cyllnder C is of considerable' length'extendingapproximately the entire length of the seat in the part B thus affordinga long bearing for the inner edge of the cutter corresponding to thebearing I under flange b for 1ts outer edge and this insuring that itshall be held in a very secure j the several cutter-holder trunnions andholding plungers 10, a very rigid support is afforded for the die at apoint nearly in l ne with the work thus permitting no expanslon of thedie to take place under the strain of the work and insuring a veryaccurate re- A sult.

Having thus fully described my said invention, what I claim as new anddesire to secure by Letters Patent, is:

1. A cutter-head for screw-cutting machines comprising' a body havingsections overhanging the face thereof, bearings for the trunnions of thecutter-holders arranged around the axis of said body and in line withsaid overhanging sections, cutterholders mounted in said bearings,cutters mounted in said cutter-holders, and means for opening andclosing the die and securing said cutter-holders in desired relationcomprising sliding plungers mounted in longitudinal perforationsextending through the trunnions of the several cutter-holders andadapted to bear upon a face of an adjacent cutter-holder, substantiallyas set forth.

2. A cutter-head for screw cutting machines comprising a body formedwith sections around its periphery overhanging its face, bearings forthe trunnions of the cutter-holders arranged around the axis of saidbody and in line with said overhanging sections, cutter-holders mountedwith their trunnions in said bearing, means for opening and closing thedie and securing the cutterholders in relative adjustment consisting ofplungers mounted to slide longitudinally in perforations extendingthrough the trunnions of the several cutter-holders being provided withtapered bearing faces adapted to engage therewith, and means for adjusting said plungers longitudinally, substantially as set forth.

3. A cutter-head for screw-cutting ma- .chines comprising a body formedwith sec tions around its periphery which overhang its face, bearingsfor the cutter-holders arranged around the axis of said body and in linewith said overhanging portions, cutterholders formed with trunnionshaving overhanging extensions on their outer outside corners extendingforward from the main body of the trunnion and adapted to bear beneathsaid overhanging portions of the body, outters mounted in saidcutter-holders, means for opening and closing the die comprisingplungers mounted in longitudinal perforations in the trunnions in saidcutter-holders, said plungers being arranged to bear upon the face ofthe adjacent cutter-holder on one side and under the overhangingportions of the trunnion and body on its other side, and means forsecuring said plungers, substantially as set forth.

4:. A cutter-head for screw-cutting machines comprising a body formedwith portions overhanging the face thereof, bearings for cutter-holdertrunnions arranged around its axis and in line with said overhangingportions, cutter-holders with trunnions mounted in said bearings, saidtrunnions being formed with overhanging extensions on their outer endsadapted to bear under said overhanging portions of the body and Withrearwardly projecting extensions on their inner ends adapted to extendthe length of the hearing within the body on their inner faces, cuttersmounted in said cutterholders, plungers mounted in longitudinalperforations extending through said trunnions formed with tapered or camfaces adapted to engage with the faces on the ad,-

jacent cutter-holders for securing them in relative adjustment and meansfor holding and adjusting said plungers, substantially as set forth.

5. A cutter-head comprising a body formed with bearings for thecutter-holder trunnions arranged around its axis, cutterholders mountedwith their trunnions in said bearings, cutters mounted in said cutter-holders, and means for securing said cutters comprising a camcylinder and a screw for adjusting said cam cylinder to throw its caminto clamping engagement with said cutters, substantially as set forth.

6. A; cutter-head comprising cutter-holders having trunnion and headsextending to one side of said trunnions containing seats for thecutters, cutters mounted in said seats, means for securing said cuttersin said seats comprising a rotary cylindrical cam, the cam face of whichis arranged to impinge against one edge of said cutter and a screwextending transversely of said cam with its inner end arranged to engagewith a notch therein for turning and holding sai cam, substantially asset forth.

7. A cutter-head comprlsmg a body, cut- ,cutters in their seats, meansfor operating and holding said cam cylinders consisting of screwsmounted in sockets extending transversely of the cylinders and arrangedwith their inner ends to engage notches in said cylinders, and means forholding and adjusting said cutters longitudinally, substantial] y as setforth.

4 8. A cutter-head for screw-cutting machines comprising a body,cutter-holders mounted therein, cutters mounted in seats in saidcutter-holders, means for holdingsaid cutters in said seats, and meansforholding and adjusting said cutters longitudinally comprisingadjusting screws formed with a series of rings or collars rigid thereonand adapted to engage on one side with transverse notches, or grooves,in the back of the cutter and-with screw-threads in the'cutterholder onthe other side, substantially as set forth.

9. A cutter-head for screw-cutting machines comprising a body,cutter-holders mounted therein, cutters mounted in said cutter-holders,and means for holding and adjusting said cutters longitudinallycomprismg adjusting screws formed with circumferential rings or collarsadapted to engage with transverse grooves, or notches, in the backs ofthe cutters, said collars or rings being formed with screw-threads ontheir periphcries and the perforation in which said grooves are mountedbeing formed screwthreaded, the threads on said collars or groovesengaging therewith, substantially as set forth. j

10. Acutter-head for screw-cutting machines comprising a body formedwith bearings around its axis for the trunnionsof the cutter-holders,cutter-holders mounted in said bearings, cutters carried by saidcutterholders, means for opening and closing the die, meansfor holdingthe die in adjusted position and means for securing the trunnions of thecutter-holders from longitudinal movement comprising. a ring'mounted ina circumferential groove formed'in the body with its inner edge engagingwith grooves formed in said trunnions, substantially as set forth.

11. A cutter-head for screw cutting machines comprising a body formedwith bearings for the cutter-holders around its axis,

' cutter-holders mounted in sai bearings, cutters mounted in saidcutter-holders, means for openlng and closing the'die, means foradjusting and securing the die, and means for holding the trunnions fromlongitudinal movement comprising a divided ring mounted in acircumferential groove in the body with their inner, edges engaging withgrooves in said trunnions, and a solid ring surrounding said dividedring for holding responding to and engagingwith the threads on theperiphery of said ring, and means for holding and adjusting saidcylinder, substantially as set forth.

13. A cutter-head for screw-cutting machines comprising a body formedwith bearings for the cutter-holder trunnions, cutterholders mountedtherein, cutters mounted on 3 said cutter-holders, sliding plungersmounted in longitudinal perforations in the trunnions'of thecutter-holders and formed with a tapered face adapted to engage withtapered faces on the adjacent cutter-holders, a ring engaging with therear ends of each of said plungers, said ring being formed with athreaded periphery, a'cylinder mounted on the body and formed withinternal threads corresponding to and adapted to engage with the threadson the periphery of said ring, a transverse screw engaging with saidcylinder and with apart fixed to said body, whereby said cylinder may beturned in relation to said body for adjusting said ring and saidplungers, substantially as set forth. 14. A cutter-head comprising abody formed with bearin for the cutter-holder trunnions around 1ts axis,cutter-holders mounted therein, cutters mounted on said cutter-holder,plungers mounted in longitudinal perforations extending through thetrunnions of said-cutter-holders and formed with tapered faces arrangedto engage faces on the adjacent cutter-holders each of said plungersbeing formed at its rear end with acircumferential groove, aring formedw1th "a flange having cut-away sections at oints corresponding .with thelocation 0 said plungers and adapted to slide over the ends thereof andturn, to bring the flange mto thegrooves of said plungers, means forsecuring said ring from rotation in relation to the body, acylinder-surrounding said ring and forined with threads engaging withthreads in the periphery of said ring, and means for adjusting andsecuring said cylinder circumferentially, whereby said ring and saidplungers are moved and secured longitudinally, substantially as setforth. 15. A cutter-head for screw-cutting machines comprising a body,cutter-holders mounted on trunnions adapted to rock in bearings in saidbody, radial spring pressed plungers adaptedto engage with notches 1nsaid trunnions for normally holding them to open the die, cuttersmounted in said cutterholders, a sleeve for securing the head to thespindle or turret of the machine, said body being mounted to slidewithin said sleeve, springs arranged to hold said bodyback against theforward end of said sleeve,

a rocking die controlling cylinder, a latchpin mounted in one part andadapted to engage with the other for locking said cylinder and bodytogether, a spring engaging at one end with the body and at theother-end with,/

the cylinder, and means for t urningfi part against the action of saidspring, stantially as set forth.

16. A cutter-head comprising a body formed with bearings for thecutter-holder trunnions around its axis, cutter-holders mounted therein,cutters mounted on said cutter-holders, plungers mounted in longitudinalperforations extending through the trunnions of said cutter-holders,said plungers having a tapered face arranged to engage a face of theadjacent cutter-holder, and means for moving said plungerslongitudinally to open and close the die, substantially as set forth.

17. A cutter-head comprising a body formed with bearings for thecutter-holder trunnions around its axis, cutter-holders mounted therein,cutters mounted on said cutter-holders, longitudinal perforationsthrough the center of said cutter-holder trunnions, and means extendingthrough said perforations to engage with the adjacent cutter-holders forcontrolling the die,

- substantially as set forth.

18. In a cutter-head, the combination, of pivoted cutter-holders,cutters in said holders, each of said holders being held in relation tothe other holders by a part extending through the axis of the adjacentholder, and said part, substantially as set forth.

19. A cutter-head comprising pivoted cut-- ter-holders arranged aroundthe axis of the head, and a sliding part extending through the axis ofeach holder and engaging a. face of the adjacent holder for controllingthe die, substantially as set forth? 20. A cutter-head comprising aframe formed with bearings for the cutter-holder trunnions and withoverhanging bearing sections p ojecting from its rim in line with saidbearings, the cutter-holders mounted with their t-runnions in saidbearings, each of said trunnions being formed with an extension on itsfront end adapted to bear against the adjacent overhanging bearingsection of the frame, the cutters on said cutter-holders, and means foroperating the die, substantially as set forth.

21. A cutter-head comprising a frame trunnions and with overhangingbearing sections adjacent to said bearings, cutter- |holders mountedwith their trunnions in l I l i i i I l said bearings and formed withextensions on their outer sides adapted to bear against said overhangingbearing sections of said frame, sliding plungers mounted in centralperforations extending through said trunnions the outer ends of whichare adapted to bear under said extensions on one side upon a face of theadjacent cutter-holder on its opposite side, means for holding andadjusting said plungers, and cutters mounted on said cutter-holders,substantially as set forth. v a

22. A cutter-head comprising a frame having bearing sections extendingbeyond the face thereof and overhanging a portion of the cutterholders,said cutter-holders mounted with their trunnions in bearings formedaround the axis of said frame and having extensions on the outer sidesof their front ends, sliding plungers mounted in longitudinalperforations in said trunnions and adapted to bear at their outer endsbetween said extensions on one side and by an angle bearing against theadjacent cutter-holder on the other side, cutters mounted on saidcutter-holders, and means for adjusting and securing said plungers,substantially as set forth.

.23. A. cutter-holder for cutter-heads of screw-cutting machinesprovided with a trunnion having an extension bearing face on the outerside of its front end and another on the inner side of its inner end,said extensions being thus diametrically opposed to each other andarranged to receive the strain of the work, substantially as set forth.

In witness whereof, I have hereunto set my hand and seal. at\Vashington, District of @olumbia this 2nd day of March, A. D. nineteenhundred and ten.

ABRAHAM B. LANDIS.

Witnesses:

J. D. YOAKLEY, E. W. BRADFORD.

sub- 1 formed with bearings for the cutter-holder

